[llvm] [X86][APX] Precommit test for BLSI/BLSMSK i8 patterns with EGPR (NFC) (PR #226793)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Evgenii Kudriashov (e-kud)

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<summary>Changes</summary>

The i8 BLSI/BLSMSK patterns always select the VEX forms, so when only extended GPRs (r16-r31) are available the operands get spilled instead of using the EVEX forms.

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Full diff: https://github.com/llvm/llvm-project/pull/226793.diff


1 Files Affected:

- (added) llvm/test/CodeGen/X86/apx/bls-egpr.ll (+137) 


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https://github.com/llvm/llvm-project/pull/226793